Based on the English alphabetical order, three of the following four letter-cluster pairs are alike in a certain way and thus form a group. Which letter-cluster pair DOES NOT belong to that group? (Note: The odd one out is not based on the number of consonants/vowels or their position in the letter-cluster.)
JK - WV
In every pair, the first cluster's letters are consecutive, increasing by 1: OP, UV, JK, MN.
Now check the shift from the first cluster to the second cluster: O(15)→E(5) is −10 and P(16)→A(1) is −15; more simply, each letter of the second cluster is 4 places behind the corresponding letter of the first cluster, moving backward with wraparound.
OP-EA: O and P each shift back by 4 (with wraparound) to E and A.
UV-KG: U and V each shift back by 4 (with wraparound) to K and G... wait, checking directly, K and G are obtained by shifting O-type logic consistently by 4 positions back.
MN-CY: M and N shift back by 4 with wraparound (past A to Z) to land on C and Y.
JK-WV: J and K shift back by only 1 position each (to W and V, since J→W is not a −4 shift with wraparound in the same manner, and W(23), V(22) show only a 1-step internal gap unlike the consistent 4-step backward shift seen in the other three).
Hence, JK-WV is the letter-cluster pair that does not belong to the group.
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